High-Side V-I Converter, 0-2V to 0-100mA, 1% Full Scale Error
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Key Document


This Verified Design delivers a well-regulated current to a ground-referenced load that could be used for actuators, sensors, motors, and many other applications. The design utilizes a two-stage approach to allow the high-side current source to accept a ground-referenced input. The first stage uses an op amp and n-channel MOSFET to translate the ground-referenced input to a supply-referenced signal. The supply-referenced signal drives the second stage op amp that controls the gate of a p-channel MOSFET to regulate the load current. The OPA2333 is used for both stages of the design because of the low quiescent current, rail-to-rail input/output, and zero-drift chopper technology. The rail-to-rail input stage includes voltages that exceed both supply rails so there is no loss or "dead-zone" when used as a low-side sink for the first stage or as a high-side source for the second stage. The rail-to-rail output ensures that the op amp is able to successfully turn off the active devices ensuring low zero-scale currents. The zero-drift architecture allows for precision DC performance over temperature.

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  • Converts Voltage to current: 0 to 2 V, 0 mA to 100 mA
  • Less than 0.1 % Error
  • Single-supply solution with rail-to-rail input dual-channel op amp
  • Good compliance voltage to the both rails
  • Design creates a current source that allows for a GND referenced load
  • Excellent DC performance and temperature drift using zero-drift OPA2333 op amp

      This Verified Design Includes:

    • Theory
    • Component Selection
    • TINA-TI Simulation
    • Schematics and PCB Layout
    • Verification and Measured Performance
    • Modification Options

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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA2333  1.8V, 17µA, 2 channels, microPower, Precision, Zero Drift CMOS Op Amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA2333 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 704 19 Sep 2013
Design files (4)
Title Type Size (KB) Date
PDF 66 20 Sep 2013
ZIP 399 19 Sep 2013
PDF 96 19 Sep 2013
ZIP 853 19 Sep 2013
Related Tools & Software

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tool 

Software development (1)

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